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leetcode-cn/problem (English)/比较版本号(English) [compare-version-numbers].html
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<p>Given two version numbers,&nbsp;<code>version1</code> and <code>version2</code>, compare them.</p>
<p>Given two <strong>version strings</strong>, <code>version1</code> and <code>version2</code>, compare them. A version string consists of <strong>revisions</strong> separated by dots <code>&#39;.&#39;</code>. The <strong>value of the revision</strong> is its <strong>integer conversion</strong> ignoring leading zeros.</p>
<p>To compare version strings, compare their revision values in <strong>left-to-right order</strong>. If one of the version strings has fewer revisions, treat the missing revision values as <code>0</code>.</p>
<p>Return the following:</p>
<ul>
</ul>
<p>Version numbers consist of <strong>one or more revisions</strong> joined by a dot&nbsp;<code>&#39;.&#39;</code>. Each revision&nbsp;consists of <strong>digits</strong>&nbsp;and may contain leading <strong>zeros</strong>. Every revision contains <strong>at least one character</strong>. Revisions are <strong>0-indexed from left to right</strong>, with the leftmost revision being revision 0, the next revision being revision 1, and so on. For example&nbsp;<code>2.5.33</code>&nbsp;and&nbsp;<code>0.1</code>&nbsp;are valid version numbers.</p>
<p>To compare version numbers, compare their revisions in <strong>left-to-right order</strong>. Revisions are compared using their&nbsp;<strong>integer value ignoring any leading zeros</strong>. This means that revisions&nbsp;<code>1</code>&nbsp;and&nbsp;<code>001</code>&nbsp;are considered&nbsp;<strong>equal</strong>. If a version number does not specify a revision at an index, then&nbsp;<strong>treat the revision as&nbsp;<code>0</code></strong>. For example, version&nbsp;<code>1.0</code> is less than version&nbsp;<code>1.1</code>&nbsp;because their revision 0s are the same, but their revision 1s are&nbsp;<code>0</code>&nbsp;and&nbsp;<code>1</code>&nbsp;respectively, and&nbsp;<code>0 &lt; 1</code>.</p>
<p><em>Return the following:</em></p>
<ul>
<li>If <code>version1 &lt; version2</code>, return <code>-1</code>.</li>
<li>If <code>version1 &gt; version2</code>, return <code>1</code>.</li>
<li>Otherwise, return <code>0</code>.</li>
<li>If <code>version1 &lt; version2</code>, return -1.</li>
<li>If <code>version1 &gt; version2</code>, return 1.</li>
<li>Otherwise, return 0.</li>
</ul>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> version1 = &quot;1.01&quot;, version2 = &quot;1.001&quot;
<strong>Output:</strong> 0
<strong>Explanation:</strong> Ignoring leading zeroes, both &quot;01&quot; and &quot;001&quot; represent the same integer &quot;1&quot;.
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">version1 = &quot;1.2&quot;, version2 = &quot;1.10&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">-1</span></p>
<p><strong>Explanation:</strong></p>
<p>version1&#39;s second revision is &quot;2&quot; and version2&#39;s second revision is &quot;10&quot;: 2 &lt; 10, so version1 &lt; version2.</p>
</div>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> version1 = &quot;1.0&quot;, version2 = &quot;1.0.0&quot;
<strong>Output:</strong> 0
<strong>Explanation:</strong> version1 does not specify revision 2, which means it is treated as &quot;0&quot;.
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">version1 = &quot;1.01&quot;, version2 = &quot;1.001&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">0</span></p>
<p><strong>Explanation:</strong></p>
<p>Ignoring leading zeroes, both &quot;01&quot; and &quot;001&quot; represent the same integer &quot;1&quot;.</p>
</div>
<p><strong class="example">Example 3:</strong></p>
<pre>
<strong>Input:</strong> version1 = &quot;0.1&quot;, version2 = &quot;1.1&quot;
<strong>Output:</strong> -1
<strong>Explanation:</strong> version1&#39;s revision 0 is &quot;0&quot;, while version2&#39;s revision 0 is &quot;1&quot;. 0 &lt; 1, so version1 &lt; version2.
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">version1 = &quot;1.0&quot;, version2 = &quot;1.0.0.0&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">0</span></p>
<p><strong>Explanation:</strong></p>
<p>version1 has less revisions, which means every missing revision are treated as &quot;0&quot;.</p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>